from django import forms
from web import models
from django.core.validators import RegexValidator
from django.core.exceptions import ValidationError
from django.conf import settings
from django_redis import get_redis_connection
import random
from utils.tencent.sms import send_sms_single
from utils.encrypt import md5
from web.forms.bootstrap import BootStrapForm


class RegisterModelForm(BootStrapForm, forms.ModelForm):
    mobile_phone = forms.CharField(label="手机号", validators=[RegexValidator(r'^(1[3|4|5|6|7|8|9])\d{9}$', '手机格式错误'), ])
    password = forms.CharField(label="密码",
                               min_length=8,
                               max_length=64,
                               error_messages={
                                   'min_length': "密码长度不能小于8位",
                                   'max_length': "密码长度不能大于64位"
                               },
                               widget=forms.PasswordInput(attrs={"class": 'form-control', 'placeholder': '请输入密码'}))
    confirm_password = forms.CharField(label="重复密码", widget=forms.PasswordInput(
        attrs={"class": 'form-control', 'placeholder': '请输入密码'}))
    code = forms.CharField(label="验证码")

    class Meta:
        model = models.UserInfo
        # fields = "__all__"
        fields = ['username', 'email', 'password', 'confirm_password', 'mobile_phone', 'code']

    def clean_username(self):
        username = self.cleaned_data['username']

        exists = models.UserInfo.objects.filter(username=username).exists()
        if exists:
            raise ValidationError("用户名已存在")
        return username

    def clean_email(self):
        email = self.cleaned_data["email"]
        exists = models.UserInfo.objects.filter(email=email).exists()
        if exists:
            raise ValidationError("邮箱已存在")
        return email

    def clean_password(self):
        pwd = self.cleaned_data["password"]
        # 加密 & 返回
        pwd = md5(pwd)
        return pwd

    def clean_confirm_password(self):
        pwd = self.cleaned_data["password"]
        confirm_pwd = self.cleaned_data["confirm_password"]
        confirm_pwd = md5(confirm_pwd)
        if pwd != confirm_pwd:
            raise ValidationError("两次密码不一致")
        return confirm_pwd

    def clean_mobile_phone(self):
        mobile_phone = self.cleaned_data["mobile_phone"]
        exists = models.UserInfo.objects.filter(mobile_phone=mobile_phone).exists()
        if exists:
            raise ValidationError("手机号已注册")
        return mobile_phone

    def clean_code(self):
        mobile_phone = self.cleaned_data.get("mobile_phone")
        code = self.cleaned_data["code"]
        conn = get_redis_connection()
        redis_code = conn.get(mobile_phone)
        if not redis_code:
            raise ValidationError("验证码失效或未发送")
        str_redis_code = redis_code.decode('utf-8')
        if code.strip() != str_redis_code:
            raise ValidationError("验证码错误")
        return code


class SendSmsForm(forms.Form):
    mobile_phone = forms.CharField(label='手机号', validators=[RegexValidator(r'^(1[3|4|5|6|7|8|9])\d{9}$', '手机号格式错误'), ])

    def __init__(self, request, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.request = request

    def clean_mobile_phone(self):
        """ 手机号校验的钩子 """
        mobile_phone = self.cleaned_data['mobile_phone']

        # 判断短信模板是否有问题
        tpl = self.request.GET.get('tpl')
        template_id = settings.TENCENT_SMS_TEMPLATE.get(tpl)
        if not template_id:
            # self.add_error('mobile_phone','短信模板错误')
            raise ValidationError('短信模板错误')
        exists = models.UserInfo.objects.filter(mobile_phone=mobile_phone).exists()
        if tpl == 'login':
            if not exists:
                raise ValidationError('手机号不存在')
        else:
            # 校验数据库中是否已有手机号
            if exists:
                raise ValidationError('手机号已存在')

        code = random.randrange(1000, 9999)

        # 发送短信
        sms = send_sms_single(mobile_phone, template_id, [code, ])
        if sms['result'] != 0:
            raise ValidationError("短信发送失败，{}".format(sms['errmsg']))

        # 验证码 写入redis（django-redis）
        conn = get_redis_connection()
        conn.set(mobile_phone, code, ex=60)

        return mobile_phone


class LoginSmsForm(BootStrapForm, forms.Form):
    """短信登录"""
    mobile_phone = forms.CharField(label="手机号", validators=[RegexValidator(r'^(1[3|4|5|6|7|8|9])\d{9}$', '手机格式错误'), ])
    code = forms.CharField(label="验证码")

    def clean_mobile_phone(self):
        mobile_phone = self.cleaned_data['mobile_phone']
        user_object = models.UserInfo.objects.filter(mobile_phone=mobile_phone).first()
        if not user_object:
            raise ValidationError('手机号不存在')
        return mobile_phone

    def clean_code(self):
        code = self.cleaned_data['code']
        user_object = self.cleaned_data.get('mobile_phone')

        # 手机号不存在，则验证码无需再校验
        if not user_object:
            return code

        conn = get_redis_connection()
        redis_code = conn.get(user_object.mobile_phone)
        if not redis_code:
            raise ValidationError("验证码失效或未发送")
        str_redis_code = redis_code.decode('utf-8')
        if code.strip() != str_redis_code:
            raise ValidationError("验证码错误")
        return code


class LoginForm(BootStrapForm, forms.Form):
    username = forms.CharField(label="邮箱或手机号")
    password = forms.CharField(label="密码",
                               min_length=8,
                               max_length=64,
                               error_messages={
                                   'min_length': "密码长度不能小于8位",
                                   'max_length': "密码长度不能大于64位",
                               },
                               widget=forms.PasswordInput(render_value=True), )
    code = forms.CharField(label="验证码")

    def __init__(self, request, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.request = request

    def clean_password(self):
        pwd = self.cleaned_data["password"]
        # 加密 & 返回
        pwd = md5(pwd)
        return pwd

    def clean_code(self):
        code = self.cleaned_data['code']
        session_code = self.request.session.get('code')
        if not session_code:
            raise ValidationError('验证码已过期，请重新获取')
        if code.upper() != session_code.upper():
            raise ValidationError('验证码输入错误')
        return code
